25m2-449
Rewrite 25m2 as (5m)2.
(5m)2-449
Rewrite 449 as (27)2.
(5m)2-(27)2
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=5m and b=27.
(5m+27)(5m-27)
Factor 25m^2-4/49
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